21344240342 has 32 divisors (see below), whose sum is σ = 33551311104. Its totient is φ = 10171353600.

The previous prime is 21344240339. The next prime is 21344240347. The reversal of 21344240342 is 24304244312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344240347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3441188 + ... + 3447384.

It is an arithmetic number, because the mean of its divisors is an integer number (1048478472).

Almost surely, 2^21344240342 is an apocalyptic number.

21344240342 is a deficient number, since it is larger than the sum of its proper divisors (12207070762).

21344240342 is a wasteful number, since it uses less digits than its factorization.

21344240342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7064.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21344240342 its reverse (24304244312), we get a palindrome (45648484654).

The spelling of 21344240342 in words is "twenty-one billion, three hundred forty-four million, two hundred forty thousand, three hundred forty-two".